Engine running hot,have new radiator. fan waas not running that i could tell, so i put in new relay.it seed to work when i first installed it, but my wife drove it the next day it ran hot again and the fans didnt seem to be working again.got any ideas ,thanks!

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You do not need a thermostat for the fan to work but you will need a thermostat for the engine not to over heat. Put simply the thermostat controls the flow of water through the radiator cores so that the heat in the water has a chance to transfer to the cores and fins and away.. NO thermostat =too fast water flow = hot engine.. Fans work off a temperature sensor which tells the CPU when to activate the relay to switch on the fan. Check out the circuit for the fan including the sensor ,fuses, relays and wiring, and fan . Fix it properly so that you can enjoy driving

it could be a possibility that the engine is running at normal temperature but your gauges are telling you that it is running hot the only way to tell is to get a temperature gauge & connect it into the water system somehow to give you an accurate reading or take the vehicle to a radiator repairer & they may be able to do it for you..........hope this helps.....cheers.

Did you check the temp sending unit? That tells the computer what the temp is and the computer then triggers the relay. Also, hot wire the fan motor and make sure it runs when it has power.As far as the radiator "busting open" if it actually did that and didn't just develop a leak, it may indicate a head gasket failure pressurizing the radiator far more than it's normal capacity.

check fuses #25 and #6 (both 30 amp) the fan thermostat is on the left side of the rad.turn the ignition on, and after pulling back the boot, short across the two terminal with a screwdriver.

if the fan runs, fan and wiring are both good.

if it only runs when thermoswitch is shorted like this, switch needs to be replaced (get the low temp switch to prevent overheating - your temp gauge will not go over the middle position even on the hottest days; also get a low temp thermostat,and ALWAYS get a Saab stat, not an after market!)

if the fan doesn't run when switch is shorted, check for valtage between green wire and ground at the switch.

Voltage indicates faulty fan, if no voltage then check the fan relay J in the main fuse box.

The radiator cooling fan relay has most likely failed. It is underneath the air cleaner on the frame rail just behind the radiator. NO cooling fan = overheating. This is the first thing i would look at. Best way to tell is when the van gets hot see if the cooling fan is on. You will hear it running if it is coming on. It will set a code for the cooling fan relay also.